xref: /netbsd-src/sys/arch/arm/fdt/plmmc_fdt.c (revision 6e54367a22fbc89a1139d033e95bec0c0cf0975b)
1 /* $NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $ */
2 
3 /*-
4  * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $");
31 
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/device.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 
38 #include <dev/fdt/fdtvar.h>
39 
40 #include <dev/ic/pl181reg.h>
41 #include <dev/ic/pl181var.h>
42 
43 static int	plmmc_fdt_match(device_t, cfdata_t, void *);
44 static void	plmmc_fdt_attach(device_t, device_t, void *);
45 
46 static const struct device_compatible_entry compat_data[] = {
47 	{ .compat = "arm,pl180" },
48 	{ .compat = "arm,pl181" },
49 	DEVICE_COMPAT_EOL
50 };
51 
52 CFATTACH_DECL_NEW(plmmc_fdt, sizeof(struct plmmc_softc),
53 	plmmc_fdt_match, plmmc_fdt_attach, NULL, NULL);
54 
55 static int
plmmc_fdt_match(device_t parent,cfdata_t cf,void * aux)56 plmmc_fdt_match(device_t parent, cfdata_t cf, void *aux)
57 {
58 	struct fdt_attach_args * const faa = aux;
59 
60 	return of_compatible_match(faa->faa_phandle, compat_data);
61 }
62 
63 static void
plmmc_fdt_attach(device_t parent,device_t self,void * aux)64 plmmc_fdt_attach(device_t parent, device_t self, void *aux)
65 {
66 	struct plmmc_softc * const sc = device_private(self);
67 	struct fdt_attach_args * const faa = aux;
68 	const int phandle = faa->faa_phandle;
69 	struct clk *clk;
70 	bus_addr_t addr;
71 	bus_size_t size;
72 	void *ih;
73 
74 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
75 		aprint_error(": missing 'reg' property\n");
76 		return;
77 	}
78 
79 	clk = fdtbus_clock_get_index(phandle, 0);
80 	if (clk == NULL) {
81 		aprint_error(": couldn't get clock\n");
82 		return;
83 	}
84 
85 	if (clk_enable(clk) != 0) {
86 		aprint_error(": couldn't enable clock\n");
87 		return;
88 	}
89 
90 	char intrstr[128];
91 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
92 		aprint_error(": failed to decode interrupt\n");
93 		return;
94 	}
95 
96 	sc->sc_dev = self;
97 	sc->sc_clock_freq = clk_get_rate(clk);
98 	of_getprop_uint32(phandle, "max-frequency", &sc->sc_max_freq);
99 	sc->sc_bst = faa->faa_bst;
100 	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_bsh)) {
101 		aprint_error(": couldn't map device\n");
102 		return;
103 	}
104 
105 	aprint_naive("\n");
106 	aprint_normal("\n");
107 
108 	ih = fdtbus_intr_establish_xname(phandle, 0, IPL_BIO, 0, plmmc_intr, sc,
109 	    device_xname(self));
110 	if (ih == NULL) {
111 		aprint_error_dev(self, "couldn't install interrupt handler\n");
112 		return;
113 	}
114 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
115 
116 	plmmc_init(sc);
117 }
118